Solve this by editing the Registry
copy the code below in a Notepad and save it as whatever.reg (you rename the .txt to .reg)
This is actually a better solution because you do not need to disable all WinKeys.

Or do it manually by opening the registry going to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
then create a new string value key, name it DisabledHotkeys, right click on it, Modify, add S in value Data.

PS If you would like to disable more windows keys, say Win+C for example, in value data write S,C